Ted Turner, population reduction, and cannibalism

Ted Turner believes that overpopulation is causing global warming and global warming will destroy the world's economy, turning humans into cannibals.

Isn't the obvious solution for people to start becoming cannibals now so we can quickly reduce the human population and so avoid global warming. Of course cannibalism might harm Turner's Buffalo meat business so perhaps this is why he isn't endorsing it. It's unfortunate how self-interest often prevents environmentalists from advocating for what is truly best for the Earth.